<template>
	<div>
		<!-- 面包屑导航区域 -->
		<el-breadcrumb separator-class="el-icon-arrow-right">
			<el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
			<el-breadcrumb-item>商品管理</el-breadcrumb-item>
			<el-breadcrumb-item>参数列表</el-breadcrumb-item>
		</el-breadcrumb>

		<!-- 卡片视图区域 -->
		<el-card>
			<!-- 头部警告区 -->
			<el-alert show-icon title="注意: 只允许为第三级分类设置相关参数!" type="warning" :closable="false">
			</el-alert>
			<!-- 选择商品 分类区域-->
			<el-row class="cat_opt">
				<el-col>
					<span>选择商品分类：</span>
					<!-- 选择商品分类的级联选择框 -->
					 <el-cascader
					    expand-trigger="hover"
					    v-model="selectedCateKeys"
					    :options="catelist"
					    :props="cateProps"
					    @change="handleChange"></el-cascader>
				</el-col>
			</el-row>
		
		<!-- tab页签区域 -->
		<el-tabs v-model="activeName" @tab-click="handleTabClick">
			<!-- 添加动态参数的面板 -->
		    <el-tab-pane label="动态参数" name="many">
				<!-- 添加参数的按钮 -->
				<el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
				<!-- 动态参数表格 -->
				<el-table :data="manyTableData" border stripe>
					<!-- 展开行 -->
					<el-table-column type="expand">
						<template slot-scope="scope">
							<!-- 循环 渲染Tag标签-->
							<el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
							<!-- 输入的文本框 -->
							<el-input
							  class="input-new-tag"
							  v-if="scope.row.inputVisible"
							  v-model="scope.row.inputValue"
							  ref="saveTagInput"
							  size="small"
							  @keyup.enter.native="handleInputConfirm(scope.row)"
							  @blur="handleInputConfirm(scope.row)"
							>
							</el-input>
							<!-- 添加的按钮 -->
							<el-button v-else 
							class="button-new-tag" size="small"
							 @click="showInput(scope.row)">+ New Tag</el-button>
						</template>
					</el-table-column>
					<!-- 索引列 -->
					<el-table-column type="index"></el-table-column>
					<el-table-column label="参数名称" prop="attr_name"></el-table-column>
					<el-table-column label="操作" prop="attr_name">
						<template slot-scope="scope">
							<el-button type="primary" 
							icon="el-icon-edit" 
							size="mini" 
							@click="showEditDialog(scope.row.attr_id)">编辑</el-button>
							<el-button type="danger" 
							icon="el-icon-delete" 
							size="mini" @click="removeParms(scope.row.attr_id)">删除</el-button>
						</template>
					</el-table-column>
				</el-table>
			</el-tab-pane>
			<!-- 添加静态属性的面板 -->
		    <el-tab-pane label="静态属性" name="only">
				<!-- 添加属性的按钮 -->
				<el-button type="primary"
				 size="mini" 
				 :disabled="isBtnDisabled"
				  @click="addDialogVisible=true">添加属性</el-button>
				<!-- 静态属性表格 -->
				<el-table :data="onlyTableData" border stripe>
					<!-- 展开行 -->
					<el-table-column type="expand">
						<template slot-scope="scope">
							<!-- 循环 渲染Tag标签-->
							<el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
							<!-- 输入的文本框 -->
							<el-input
							  class="input-new-tag"
							  v-if="scope.row.inputVisible"
							  v-model="scope.row.inputValue"
							  ref="saveTagInput"
							  size="small"
							  @keyup.enter.native="handleInputConfirm(scope.row)"
							  @blur="handleInputConfirm(scope.row)"
							>
							</el-input>
							<!-- 添加的按钮 -->
							<el-button v-else 
							class="button-new-tag" size="small"
							 @click="showInput(scope.row)">+ New Tag</el-button>
						</template>
					</el-table-column>
					<!-- 索引列 -->
					<el-table-column type="index"></el-table-column>
					<el-table-column label="属性名称" prop="attr_name"></el-table-column>
					<el-table-column label="操作" prop="attr_name">
						<template slot-scope="scope">
							<el-button type="primary"
							 icon="el-icon-edit" size="mini" 
							 @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
							<el-button type="danger" 
							icon="el-icon-delete" 
							size="mini"  @click="removeParms(scope.row.attr_id)">删除</el-button>
						</template>
					</el-table-column>
				</el-table>
			</el-tab-pane>		    
		  </el-tabs>
		</el-card>
		
		<!--添加参数的对话框  -->
		<el-dialog
		  :title="'添加'+titleText"
		  :visible.sync="addDialogVisible"
		  width="50%" @close="addDialogClosed">
		  <!--  添加参数的对话框-->
		  <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
		    <el-form-item :label="titleText" prop="attr_name">
		      <el-input v-model="addForm.attr_name"></el-input>
		    </el-form-item>
		  </el-form>
		  <span slot="footer" class="dialog-footer">
		    <el-button @click="addDialogVisible = false">取 消</el-button>
		    <el-button type="primary" @click="addParams">确 定</el-button>
		  </span>
		</el-dialog>
		
		<!-- 修改参数的对话框 -->
		<el-dialog
		  :title="'修改'+titleText"
		  :visible.sync="editDialogVisible"
		  width="50%" @close="editDialogClosed">
		  <!--  添加参数的对话框-->
		  <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
		    <el-form-item :label="titleText" prop="attr_name">
		      <el-input v-model="editForm.attr_name"></el-input>
		    </el-form-item>
		  </el-form>
		  <span slot="footer" class="dialog-footer">
		    <el-button @click="editDialogVisible = false">取 消</el-button>
		    <el-button type="primary" @click="editParams">确 定</el-button>
		  </span>
		</el-dialog>
	</div>
</template>

<script>
	export default {
		data() {
			return {
				//商品分类列表
				catelist: [],
				//级联选择框的配置对象
				cateProps: {
					value: 'cat_id',
					label: 'cat_name',
					children: 'children'
				},
				//级联选择框双向绑定到的数组
				selectedCateKeys: [],
				//被激活的页签的名称
				activeName:'many',
				//动态参数的数据
				manyTableData:[],
				//静态属性的数据
				onlyTableData:[],
				//控制添加对话框的显示与隐藏
				addDialogVisible:false,
				//添加参数的表单数据对象
				addForm:{},
				//添加表单的验证规则对象
				addFormRules:{
					attr_name:[
						{required:true,message:'请输入参数名称',trigger:'blur'}
					]
				},
				// 控制修改对话框的显示与隐藏
				editDialogVisible:false,
				//修改的表单数据对象
				editForm:{},
				//修改表单的验证规则对象
				editFormRules:{
					attr_name:[
						{required:true,message:'请输入参数名称',trigger:'blur'}
					]
				}
			}
		},
		created() {
			this.getCateList()
		},
		methods: {
			//获取所有商品分类列表
			async getCateList() {
				const {
					data: res
				} = await this.$http.get('categories')
				if (res.meta.status !== 200) {
					return this.$message.error('获取商品分类失败!')
				}

				this.catelist = res.data

				console.log(this.catelist)
			},
			//级联选择框选中项变化会触发这个函数
			 handleChange() {
				this.getParamsData()
			},
			//tab 页签点击事件的处理函数
			handleTabClick(){
				console.log(this.activeName)
				this.getParamsData()
			},
			//获取参数的列表数据
			async getParamsData(){
				//证明选中的不是三级分类
				if(this.selectedCateKeys.length !==3){
					this.selectedCateKeys = []
					this.manyTableData = []
					this.onlyTableData = []
					return
				}
				//证明选中的是三级分类
				console.log(this.selectedCateKeys)
				//根据所选分类的Id,和当前所处的面板，获取对应的参数
				const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`
				,{params :{sel:this.activeName}
				})
				if (res.meta.status !== 200) {
					return this.$message.error('获取参数列表失败')
				}	
							
				res.data.forEach(item => {
					item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') :[]
					//控制文本矿的的显示与隐藏
					item.inputVisible = false
					//文本框中输入的值
					item.inputValue = ''
				})
				
				console.log(res.data)
				if(this.activeName === 'many'){
					this.manyTableData = res.data
				}else{
					this.onlyTableData = res.data
				}
			},
			//监听添加对话框的关闭事件
			addDialogClosed(){
				this.$refs.addFormRef.resetFields()
			},
			//点击按钮，添加参数
			addParams(){
				this.$refs.addFormRef.validate(async valid=>{
					if(!valid)return
					const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`
					,{
						attr_name:this.addForm.attr_name,
						attr_sel:this.activeName
					})
					if (res.meta.status !== 201) {
						return this.$message.error('添加参数列表失败！')
					}
					this.$message.success('添加参数列表成功！')
					this.addDialogVisible = false
					this.getParamsData()
				})
			},
			//点击按钮展示修改的对话框
			 async showEditDialog(attr_id){
				//查询当前参数的信息
				const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
					params :{attr_sel:this.activeName}
				})
				if (res.meta.status !== 200) {
					return this.$message.error('添加参数信息失败！')
				}
				
				this.editForm = res.data
				this.editDialogVisible = true
			},
			//重置修改的表单
			editDialogClosed(){
				this.$refs.editFormRef.resetFields()
			},
			//点击按钮,修改参数信息
			editParams() {
				this.$refs.editFormRef.validate(async valid=>{
					if(!valid)return 
					const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
					{attr_name:this.editForm.attr_name,attr_sel:this.activeName
					})
					if (res.meta.status !== 200) {
						return this.$message.error('修改参数失败！')
					}
					this.$message.success('修改参数成功！')
					this.getParamsData()
					this.editDialogVisible = false
				})
			},
			//根据id删除对应的操作项
			async removeParms(attr_id){
				const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
				          confirmButtonText: '确定',
				          cancelButtonText: '取消',
				          type: 'warning'
				        }).catch(err => err)
						
					//用户取消了删除的操作
						if(confirmResult !=='confirm'){
							return this.$message.info('已取消删除！')
						}
						//删除的业务逻辑
						const {data:res} = await this.$http.delete(
						`categories/${this.cateId}/attributes/${attr_id}`
						)
						if (res.meta.status !== 200) {
							return this.$message.error('删除参数失败！')
						}
						this.$message.success('删除参数成功！')
						this.getParamsData()
			},
			//文本框失去焦点，或摁下了  enter 都会触发
			async handleInputConfirm(row){
				if(row.inputValue.trim().length===0){
					row.inputValue = ''
					row.inputVisible = false
					return
				}
				//如果没有Return 则证明输入的内容需要做后续处理
				row.attr_vals.push(row.inputValue.trim())
				row.inputValue = ''
				row.inputVisible = false
				//需要发起请求，保存这次操作
				this.saveAtterVals(row)
				
			},
			//将attr_vals 的操作保存到数据库中
			async saveAtterVals(row){
				const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
					attr_name :row.attr_name,
					attr_sel :row.attr_sel,
					attr_vals:row.attr_vals.join(' ')
				})
				
				if (res.meta.status !== 200) {
					return this.$message.error('修改参数项失败！')
				}
				this.$message.success('修改参数项成功！')
			},
			//点击按钮展示文本输入框
			showInput(row){
				row.inputVisible = true
				//让文本框自动获得焦点
				//$nextTick 方法的作用，就是当页面上的元素被重新渲染之后才会指定回调函数中的代码
				 this.$nextTick(_ => {
				          this.$refs.saveTagInput.$refs.input.focus()
				        })
			},
			//删除对应的参数可选项
			handleClose(i,row){
				row.attr_vals.splice(i,1)
				this.saveAtterVals(row)
			}
		},
		//计算属性
		computed:{
			//如果按钮需要被禁用返回true 否则返回false
			isBtnDisabled(){
				if(this.selectedCateKeys.length !== 3){
					return true
				}
				return false
			},
			//当前选中的三级分类的Id
			cateId(){
				if(this.selectedCateKeys.length === 3){
					return this.selectedCateKeys[2]
				}
				return null
			},
			//动态计算标题的文本
			titleText(){
				if(this.activeName==='many'){
					return'动态参数'
				}
				return '静态属性'
			}
		}
	}
</script>

<style>
	.cat_opt {
		margin: 15px 0;
	}
	.el-cascader{
		width: 300px;
	}
	.el-tag{
		margin: 10px;
	}
	.input-new-tag{
		width: 50px;
	}
</style>
